Research On Apparatus Of Measurement In Photovoltaic Array Based On ARM Microcomputer

With the development of the world's economy and scarcity of traditional energy sources, utilization of new energy sources is becoming more and more significant, especially the solar energy. Thus, more and more solar energy stations appear, for the sake of the solar array configuration being proper and using energy efficiently, it is necessary to test and analyze the characteristic of solar array.Basing on former experiences, this disquisition puts forward a test method in which the voltage and current signals are sampled continually by a high-speed AD convertor during charging capacitor by solar array, then the characteristic of solar array will be analysed.What the novel point of this system is that a very popular embedded microcomputer ARM is applied in this system as the primary process part, and a creative concept "portable instrument" is highlighted. Moreover, man-machine conversation manner is obviously intuitionistic and convenient.The following tasks have been done:1. Design the proper hardware circuits and software according to the principles of characteristic measure.2. Choose a fit mathematic model of solar array to make the curve of PV-characteristic display on LCD screen.3. Programmed the monitor software and the characteristic of solar array is described in graph and number.4. Estimate the PV-characteristic in any conditions by the solar array data acquired in current temperature and sun light intensity.The experiments and the results show that the system is convenience and of high precision, and can show the characteristic of solar array in different ways.